Influence of long-term storage in cold hibernation on strain recovery and recovery stress of polyurethane shape memory polymer foam
Abstract
In this paper, the effects of long-term storage in compressed cold hibernated elastic memory (CHEM) polyurethane foam, a kind of shape memory polymer, are investigated experimentally. The foams were pre-strained at a high temperature, which was above the glass transition temperature, to 80% and 93.4%, respectively, and then cooled back to room temperature. After various periods of cold hibernation (up to two months), they were heated up at fixed length or against different constant loads. It is found that: (1) the maximum stress that the foam could exert at fixed length depends heavily on the amount of pre-strain; (2) expansion rates of 380 and 1273% from the hibernated size against a 1 N load (pre-strained by 80 and 93.4%, respectively) are achievable. However, upon further increases in load, the expansion is reduced dramatically. It appears that the tested CHEM polyurethane foam retains its shape memory properties even after being stored in a compacted state for a long period. Complete strain recovery is attainable for a hibernation period of up to two months.
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Cold hibernation at 30 °C on CHEM polyurethane foam revealed an expansion back to its original shape within approximately four days.
“The analysis of the effect of cold hibernation at 30 °C on CHEM foam revealed an expansion back to its original shape within approximately four days.”
From Review on the Functional Determinants and Durability of Shape Memory Polymers (2010) · cites this paper as [277]
An adequate material performance of CHEM foam could be achieved by applying a mechanical restraint during hibernation.
“However, an adequate material performance could be achieved by applying a mechanical restraint during hibernation.”
From Review on the Functional Determinants and Durability of Shape Memory Polymers (2010) · cites this paper as [277]
The material behavior of CHEM foam was attributed to the pretty high storage temperature of the foam, which was selected very close to the transition temperature.
“The material behavior was attributed to the pretty high storage temperature of the foam, which was selected very close to the transition temperature.”
From Review on the Functional Determinants and Durability of Shape Memory Polymers (2010) · cites this paper as [277]
The maximum recoverable stress of CHEM foam was dependent on the amount of initially applied strain.
“In this case, complete shape recoverability could be detected even after a hibernation period of two months at 30 °C; beyond, the maximum recoverable stress was dependent on the amount of initially applied strain.”
From Review on the Functional Determinants and Durability of Shape Memory Polymers (2010) · cites this paper as [277]
Complete shape recoverability of CHEM foam could be detected even after a hibernation period of two months at 30 °C.
“In this case, complete shape recoverability could be detected even after a hibernation period of two months at 30 °C; beyond, the maximum recoverable stress was dependent on the amount of initially applied strain.”
From Review on the Functional Determinants and Durability of Shape Memory Polymers (2010) · cites this paper as [277]
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- Authors
- Tey, S. J., Huang, W. M., & Sokolowski, W. M.
- Affiliations
- Nanyang Technological University (SG)
- Jet Propulsion Laboratory (US)
- ORCID
- Huang, W M
- Venue
- Smart Materials and Structures
- Publisher
- IOP Publishing
- Published
- 2001-04-01
- Volume
- 10
- Issue
- 2
- Pages
- 321-325
- ISSN
- 0964-1726 (ISSN-L)
- 1361-665X
- OpenAlex
- W2009949522
- Cited by
- 108
- References
- 6
- Citations by year
- 2025: 2 · 2024: 1 · 2023: 2 · 2022: 3 · 2021: 2 · 2019: 4 · 2018: 4 · 2017: 5 · 2016: 6 · 2015: 4 · 2014: 9 · 2013: 6 · 2012: 10
- FWCI
- 4.55
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Smart Materials and Structures (publishedVersion)
- Topics
- Physical Sciences › Engineering › Mechanical Engineering › Advanced Materials and Mechanics
- Physical Sciences › Materials Science › Polymers and Plastics › Polymer composites and self-healing
- Physical Sciences › Materials Science › Materials Chemistry › Shape Memory Alloy Transformations
- Keywords
- shape memory polymer foam, polyurethane foam, long-term storage, strain recovery, recovery stress, pre-strain, shape memory effect
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